Connecting-rod jig.



W. D. CHAMBERLAND.

Patented July 2, 1918.

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CONNECTING-ROD JIG.

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To all whom it may-concern: Be it known that I, WILLIAM D. CHAM-BERLAND, a citizen of the United States, re-

siding at Minneapolis, in the county of vide an improved jig for use intruing up and alining the bearings of connecting rods such as used inexplosive engines, for example, and to the above ends, generally stated,the invention consists of the novel construction andcombination of partshereinafter described and defined in the claims. The invention isillustrated in the accon1- panying drawings, wherein like charactersindicate like parts throughout the several views.

Referring to the drawings:

Figure 1 is a plan view showing the improved jig and illustrating themanner in which it is used;

Fig. 2 is a side elevation of the same; and

3 is a front elevation of the parts shown in Figs. 1 and 2, some partsbeing broken away.

The jig comprises a base 4-, preferably cast and lightened up by acentral opening. To the rear portion of the base 4;, relatively long orhigh upright gage posts 5 are rigidly secured, and to the front portionof said base, relatively short gage posts 6 are rigidly secured. Thesaid posts 5 and 6 preferably have the same lateral spacing. Castintegral with, or otherwise rigidly secured to the rear portion of thebase 4:, between the posts 5, but nearer to one than to the other, is aheavy lug 8 having a horizontally projected stud 9. The axis of thisstud 9 is preferably but slightly above the horizontal plane of theupper ends of the short gage posts 6, and as an important feature, theaxis of said stud 9 is located slightly forward of the relatively highrearposts 5 (see particularly Fig. 2). Located between the short frontgage posts 6 is a pair of uprigh -ft laterally spaced al nil g'Specification of Letters Patent.

Patented duly 2, little.

pins 10. A point midway between the alin- .ingpins 10 is also midwaybetween the gage posts 6.

A connecting rod such as used in explosive engines is indicated as anentirety by the character A, the same having at one end a dividedbearing sleeve 6, and having at its other end a divided bearing sleeve0. The sections of the bearing sleeve 6 are connected in the customaryway by nutequipped bolts 6 while the sections of the bearing sleeve 0are connected by machine screws 0 The particular form of the connectingrod, of course, does not constitute a feature of the present invention.Character (Z indicates a gage rod which is adapted to be clamped at itscentral portion between the sections of the split sleeve c.

in the use of the either after or be fore the gage rod (Z is clamped inthe sleeve 0, the larger sleeve 6 may be applied on the stud 9 bylateral movement and adjusted so that it will snugly, but not tootightly, fit

then fits between the alining pins 10, this fact will show that the twosleeves b and 0 are in proper longitudinal alinement. Utl erwise stated,if one of the said sleeves is olfset laterally out of longitudinalalinement with the other, then the sleeve 0 will not freely enterbetween the alining pins 10 and the connecting rod must then be bentuntil the said sleeves will thus aline.

If when the connecting rod is turned down, asstated, the ends of thegage rod 05 rest upon the upper ends of both short posts 6, then thisfact will indicate that the axes of the two sleeves b and c are in thesame plane, but it does not indicate, however, that the said axes areparallel to each other. Obviously, if the gage rod d does not rest uponthe upper ends of both of the short gage posts 6, then the connectingrod must be twisted, which may be done by using the gage rod d as alever, until the said gage rod will rest upon both of the said posts 6.

Next, if when the connecting rod is turned into an upright positionindicated by dotted lines in Fig. 9, the ends of the gage rod d engagethe upper end f both f the long WILLIAM i). CHAMBERLAND, oririnnzearoms, Minnesota, assienor. or nun-HALF gage posts 5, then thisfact will indicate that the axes of the two bearing sleeves b and areparallel to each other in the said common plane. If this engagement withthe ends of the gage rod d with the gage post does not take place in thefirst trial, then the connecting rod must be bent until the above notedcontact does take place.

Here it will be noted that by virtue of the forward location of the axisof the stud 9 and the length of the gage posts 5 in respect to theconnecting rod, the said connecting rod when turned to the upward limit,shown by dotted lines in Fig. 2, will be stopped by engagement of theends of the gage rod d with the upper ends of the gage posts 5, overwhich they cannot pass.

By the use of the above described jig, connecting rods may be veryquickly and easily trued up andbent into correct form. The fact that thestud 9is supported at one .end only makes it possible, by lateralmovements of the connecting rod, to quickly apply the same to the saidstud and to quickly remove the same therefrom. Also the jig is of simpleform and may be constructed at comparatively small cost.

What I claim is:

1. A jig for use in truing connecting rods and the like, comprising agage rod, a base Y having a raised stud supported at one end only, andlaterally spaced pairs of relatively long rear and relatively shortfront gage posts for engagement with the gage rod held in the commonbearing sleeve of a connecting rod having its other bearing sleeveapplied on said stud. j

2. A jig for use in truing connecting rods and the like, comprising agage rod, a base having a raised stud supported at one end only,laterally spaced pairs .of relatively long rear and. relatively shortfront gage posts for engagement with the gage rod held in the commonbearing sleeve of a connecting-rod having its otherbearing sleeveappliedon said stud, and laterally spaced alining pins secured on saidbase between said short front gage posts.

3. A'jig for use in truing connecting rods and the like, comprising abase having laterally spaced pairs of relatively long rear gage postsand relatively short front gage posts, and provlded wlth a raisedbearing lug between said rear gage posts, and a stud secured to and proecting laterally from said lug.

4. A jig for use in truing connecting rods and the like, comprising abase having laterally spaced pairs of relatively long rear gage postsand relatively short front gage long rear and relatively short frontgage posts for engagement with the gage rod held in the common bearingsleeve of a connecting rod having its other bearing sleeve ap plied onsaid stud, the axis of said stud being forward of said rear gage posts.

6. A jig for use in truing connecting rods and the like, comprising abase having laterally spaced pairs of relatively long rear gage postsand relatively short front gage posts, and provided with a raisedbearing lug between said rear gage posts, and a stud secured to andprojecting laterally from said lug, said base between said short frontgage posts having a pair of upright alining pins, the axis of said studbeing forward of said relatively long rear gage posts.

In testimony whereof I afiix my signature in presence of two witnesses.

WILLIAM D. CHAMBERLAND. Witnesses:

EVA E. Komc,

HARRY D. KILGORE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

, Washington, I). 0. i

